Chen, Y., Kubzansky, L. D., Kim, E. S., Koga, H., Shiba, K., Padgett, R. N., Wilkinson, R., Johnson, B. R., VanderWeele, T. J. (2025). The distribution of optimism across sociodemographic groups in 22 countries. Scientific Reports. https://doi.org/10.1038/s41598-024-77257-1